Gree Ultra Heat GMV-VQ72W/A-F, Service Manual

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Ultra Heat GMV VRF Technical Service Manual_Heat Recovery Serial MAINTENANCE
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PART 3 KEY PARTS MAINTENANCE
1 CAUTIONS ON CONTROLLER REPLACEMENT
1.1 Cautions on IDU AP1 Replacement
Before replacing IDU AP1, determine the module is a master IDU or a slave IDU. For heat recovery
VRF, there is no master IDU.
1.1.1 AP1 DIP setting and jumper cap confirmation
Whatever the AP1 you replace is a master IDU AP1 or a slave IDU AP1, after it is replaced, check
original DIP setting and model.
Configure capacity DIP for the new AP1 and confirm its jumper cap, fan overload detect terminal,
and overflow detect terminal. They should be kept identical to those of the faulty AP1.
Their positions and corresponding silkscreen are as follows:
Capacity DIP: S1 (Capacity)
Jumper cap: U22 (Jump)
Overflow detect terminal: CN35(WATER-DTCT)
Fan overload detect terminal: CN36(OVC-FAN)
1.1.2 Restoring AP1 engineering parameters to factory settings (this step is not
required for original packaged parts)
After wiring, whatever the AP1 is a master IDU AP1 or a slave IDU AP1, the new AP1 must be
restored to factory settings. There are three methods to restore engineering parameter settings:
(1) If the IDU is configured with wired control, set P35 and P36 to default values.
(2) If the IDU is configured with wireless control, use the special control YV1L1 to set P35 and P36
to default values.
(3) If the IDU is configured with wireless control and special control, you can restore engineering
settings through the AP1 SW1 button. After AP1 is powered on, press and hold SW1 for 5 seconds. If a
tick sound is heard, release the button.